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NAME

     munmap - remove a mapping

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/mman.h>

     int
     munmap(void *addr, size_t len);

DESCRIPTION

     The munmap() system call deletes the mappings for the specified address
     range, and causes further references to addresses within the range to
     generate invalid memory references.

RETURN VALUES

     The munmap() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS

     The munmap() system call will fail if:

     [EINVAL]           The addr argument was not page aligned, the len
                        argument was zero or negative, or some part of the
                        region being unmapped is outside the valid address
                        range for a process.

SEE ALSO

     madvise(2), mincore(2), mmap(2), mprotect(2), msync(2), getpagesize(3)

HISTORY

     The munmap() system call first appeared in 4.4BSD.